Last night everything was normal on Twitter. Today, when I logged on to Twitter, I could only see a few tweets and no more. I waited a few hours and retried only to realize that older tweets are not loaded whereas the new tweets are loaded. This is the screenshot of where the tweets end in the page:

Now I can only see the tweets tweeted in the last 8 hours. I tried this on my mobile phone and on another PC, and the result is the same.

When I open the profile of someone whom I follow, their tweets are shown properly.